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Studies on the Reproductive Potential of Homoplastic and Heteroplastic Pituitary Hormones in Heterobranchus Bidorsalis (Geoffroy Saint Hilaire, 1809)

By Animal Research International, University Of Nigeria, Nsukka.

Summary

ABSTRACT:
Artificial induce breeding of gravid Heterobranchus bidorsalis was carried out using two hormonal materials – homoplastic and heteroplastic hormones. The study which involved 10 trials was carried out with 60 gravid female and 20 mature male. The broodfish used for the study were 18 months hatchery produced H. bidorsalis. The hormonal treatments led to the following results in terms of percentage weight loss (3.16 and 3 06%); fertilization rate (9522.77 ± 348 13 and 8,857.93 ± 255 57); and hatchability (9,180 13 ± 343 37 and 8,476.83 ± 345 95) for homoplastic and heteroplastic hormones respectively. The mean numbers of dead eggs were 396.10 ± 19.15 for homoplastic hormone injected catfish and 425.53 ± 17.09 for those injected heteroplastic hormone. Recorded de ormed of larva were low (35.80 ± 1.11 and 34.27 ± 1.43) respectively for catfish injected homoplastic and heteroplastic hormones. Survival of hatchlings was high (99.61 and 99 59 %) for gravid catfish in ected homoplastic and heteroplastic hormones respectively. There was no significant difference (P < 0 05) in weight of pre and post female spawners. Although the two tested hormones investigated were effective inducers, homoplastic hormone is . . j . recommended as it recorded better results.
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